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Thermosplastic vulcanizates from blends of a polypropylene and elastic alpha -olefin/cyclic olefin copolymers

Inactive Publication Date: 2000-09-19
ADVANCED ELASTOMER SYST LP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In accordance with the present invention, thermoplastic vulcanizates comprising a semi-crystalline polyolefin and a rubbery thermoplastic copolymer having good strength and surface properties without significant loss of optical or tensile properties are provided. The thermoplastic vulcanizates also have reduced oil swell in most hydrocarbon oils (aliphatic) due to the inclusion of repeat units in the copolymer from cyclic olefin monomers.
The copolymerization process can be a continuous or batch reaction. Typically, the continuous process, where reactants are continuously fed to the reactor and product continuously withdrawn, is preferred in commercial production facilities for economic reasons. The continuous process also has the advantage of promoting more uniform comonomer incorporation into the polymer.

Problems solved by technology

They suffer however from brittleness in certain applications.
These blends with EPR or EPDM are less brittle and provide an improved impact resistance, however they often suffer from reduced gloss, haze, and poor tactile quality, as well as decreased flexural modulus when these properties are compared to the original semi-crystalline homopolymer.

Method used

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  • Thermosplastic vulcanizates from blends of a polypropylene and elastic alpha -olefin/cyclic olefin copolymers

Examples

Experimental program
Comparison scheme
Effect test

example 2

Several blends, A-H, were physically mixed using a Brabender Counter rotating mixer using the small mixing head (45 ml). Mixing conditions were as follows:

The head was preheated to 190.degree. C. for 5 minutes. A manually blended mixture was fed into the mixing chamber with screws rotating at 60 rpm. The mixture was blended for 5 minutes and then removed. The blends were then compression molded. The blends and the test data are reported in Table 2.

Several blends (M-T) were mixed and pelletized using two passes through a single screw extruder with a 200 mesh screen pack. The pellets were injection molded into test pieces.

The copolymers were selectively tested for norbornene content by carbon nuclear magnetic resonance (CNMR) and / or proton NMR (.sup.1 HNMR); molecular weight (M.sub.w) and molecular weight distribution (M.sub.w / M.sub.n) by gel permeation chromatography; and glass transition temperature (T.sub.g) by differential scanning calorimetry (DSC) using ASTM E 1356. The DMTA wa...

example 3

11.6 of PP4 was physically admixed with 11.6 g of ENB3 then poured into a preheated Brabender with 0.1201 g of di-t-butyl peroxide (98.5 % pure). The components were blended for ten minutes at 190 C. using a small 45 g mixing head. The cured blend was then tested for physical properties. The data for the cured blend, one uncured blend and neat polypropylene are summarized in Table 5.

The data show that the rubbery thermoplastic copolymer will crosslink to improve the toughness of the blends to such an extent that they are competitive in properties with commercial reactor thermoplastic olefins. The instant blends are different however because the rubbery thermoplastic copolymer has a higher packing length than the semi-crystalline polymer causing it to be excluded from the surface. Packing length is defined and measured or calculated in Fetters, L. J., Lohse, D. J. Richter, D., Witten, T. A., and Zirkel, A. Macromolecules, 1994 incorporated by reference herein. After crosslinking the ...

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Abstract

Thermoplastic vulcanizate blends are prepared from a semi-crystalline polymer and a rubbery copolymer derived from copolymerizing at least one alpha-olefin monomer and at least one cyclic olefin copolymer. The rubbery copolymer also includes repeat units from at least one polyene monomer. The polyene monomer provides residual unsaturation for crosslinking of said rubbery copolymer. Crosslinking the rubbery copolymer of the blend generally reduces tension set, compression set and oil swell in aliphatic solvents. The cyclic olefin monomer reduces oil swell in aliphatic oils.

Description

This invention relates to thermoplastic vulcanizates of crystalline or semi-crystalline polyolefin, such as polypropylene, with predominately amorphous, elastomeric copolymers (rubbery copolymers) from alpha olefin and cyclic olefin monomers. The rubbery copolymers have reduced oil swell as compared to ethylene-proylene-diene copolymers (EPDM). Their use in a thermoplastic vulcanizate results in a vulcanizate with rubbery properties but with lower oil swell than similar vulcanizates with EPDM rubber.BACKGROUND OF INVENTIONSemi-crystalline polyolefin such as polypropylene are versatile polymers useful in many applications since their crystallinity imparts desirable mechanical properties such as stiffness. They suffer however from brittleness in certain applications. One of the methods used to reduce the brittleness of semi-crystalline polymers is to blend them with low glass transition temperature (Tg) elastomers such as ethylene-propylene rubber or ethylene-propylene-diene modified ...

Claims

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Application Information

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IPC IPC(8): C08L23/00C08L23/10C08L23/16C08L23/12C08F210/00C08F210/02
CPCC08L23/10C08L23/12C08L23/16C08F210/02C08L2205/22C08L2314/06C08L2666/04C08F232/00C08F2500/25
Inventor ABDOU-SABET, SABETHARRINGTON, BRUCE A.BRANT, PATRICKDIAS, ANTHONY J.DATTA, SUDHIN
Owner ADVANCED ELASTOMER SYST LP
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